Spring disc structure of air spring shock absorber and air spring shock absorber

Abstract

The spring disc structure comprises a spring disc body, a spring disc check ring and a clamping spring, at least two annular sealing rings are arranged in the spring disc body, the annular sealing rings are in interference fit with the spring disc body, the inner ring of the spring disc check ring is provided with a clamping spring matching face and a positioning face, and the clamping spring matching face and the positioning face are arranged on the inner ring of the spring disc check ring. The width of the clamping spring matching face is larger than that of the clamping spring, the clamping spring matching face and the positioning face are both in contact with the clamping spring, at least two annular sealing rings are arranged to be in interference fit with the spring plate body, the clamping ring is matched with the wide matching face and the positioning face of the spring plate check ring, and a double-sealing structure is formed. Firstly, the double sealing rings can form redundant sealing under the axial pressure, when sealing on one side loses efficacy due to abrasion or extreme working conditions, the other side can still maintain the sealing performance, and the air leakage risk is remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of shock absorber, especially to a spring disc structure of air spring shock absorber and air spring shock absorber. BACKGROUND

[0002] As the core component of vehicle suspension system, the sealing performance and reliability of air spring shock absorber directly affect the driving comfort and safety. The spring disc of traditional air spring shock absorber adopts single sealing ring structure and is fixed through the snap spring and outer cylinder. However, the existing design has the following technical defects:

[0003] 1. Insufficient sealing reliability: single sealing ring is prone to failure due to wear, aging or extreme deformation under high pressure or complex working conditions, causing air leakage or oil leakage. Especially in the case of frequent vibration or high temperature environment of the vehicle, the sealing ring is prone to local stress concentration, accelerating fatigue damage, resulting in significant reduction of sealing life.

[0004] 2. Defects of snap spring mounting structure: the width of the traditional snap spring matching surface is relatively narrow, which is prone to sharp contact with the sealing ring during installation, causing surface scratches or cutting of the sealing ring. In addition, the insufficient positioning accuracy of the snap spring can cause axial displacement of the spring disc, further aggravating the instability of the sealing interface.

[0005] 3. Poor material and environmental adaptability: conventional rubber sealing ring is prone to hardening and cracking in high temperature (> 150℃) or corrosive environment, resulting in a sharp drop in sealing performance. At the same time, the lack of effective heat dissipation design accelerates the aging of the sealing ring under high temperature working conditions, affecting the overall life of the shock absorber.

[0006] 4. Insufficient pressure balance and heat dissipation: the existing spring disc structure lacks dynamic pressure regulation mechanism, and the pressure difference inside and outside the sealing ring will cause deformation failure. In addition, the heat accumulation in the sealing area is difficult to dissipate quickly, aggravating the material performance degradation.

[0007] In view of the above problems, some improvement schemes try to improve the performance by increasing the number of sealing rings or optimizing the structure of the snap spring, but there are still limitations. For example, the multi-sealing ring design is prone to interference wear if the spacing is not appropriate; the snap spring widening design cannot avoid edge damage if not combined with end face optimization. In addition, the traditional pressure relief and heat dissipation structure is complex, increasing the production cost and assembly difficulty. UTILITY MODEL CONTENT

[0008] The utility model aims to provide a spring disc structure and air spring shock absorber with reliable sealing and stable working.

[0009] In order to achieve the above object, the utility model discloses the following technical scheme: a spring disc structure of air spring shock absorber, including spring disc body, spring disc baffle and snap spring, wherein, at least two annular sealing rings are equipped in the spring disc body, the annular sealing ring is with spring disc body interference fit, the inner ring of spring disc baffle is provided with snap spring cooperation face and locating surface, the width of snap spring cooperation face is greater than the width of snap spring, and snap spring cooperation face and locating surface all are in contact with snap spring.

[0010] One of the embodiments, the spring disc baffle is provided with the end face that contacts with the annular sealing ring, the end face is a plane, and the width of the end face is greater than the width of the snap spring.

[0011] One of the embodiments, the annular sealing ring is provided with two, and the annular sealing ring includes a first sealing ring and a second sealing ring.

[0012] One of the embodiments, the annular sealing ring is an O-shaped sealing ring, the cross section of the O-shaped sealing ring is circular, and the ratio of the cross section diameter of the O-shaped sealing ring to the groove depth of the mounting groove on the spring disc body is 1:1.2-1.5.

[0013] One of the embodiments, the material of the annular sealing ring is fluorine rubber, the surface of the annular sealing ring is coated with a wear-resistant coating, and the thickness of the wear-resistant coating is 0.05mm-0.1mm.

[0014] One of the embodiments, the spring disc body is provided with a stepped mounting groove, the annular sealing ring is interference fitted at the stepped plane of the mounting groove, and the bottom of the mounting groove is provided with a pressure relief groove.

[0015] One of the embodiments, the inner side of the annular sealing ring is provided with a pressure balance hole, the pressure balance hole penetrates to the mounting groove of the spring disc body, and the diameter of the pressure balance hole is 1mm-2mm.

[0016] One of the embodiments, the outer periphery of the spring disc body is provided with a heat dissipation fin, and the heat dissipation fins are uniformly distributed in the circumferential direction.

[0017] The utility model also provides a kind of air spring shock absorber, including outer cylinder, wherein, the spring disc structure described in the above any technical scheme is equipped on the outer cylinder, the outer cylinder is provided with snap spring groove, the snap spring is installed in the snap spring groove, and the annular sealing ring is interference fitted with outer cylinder.

[0018] One of the embodiments, the oil guide groove is annular and communicated to the oil cavity of the shock absorber.

[0019] After adopting the above technical scheme, the utility model has the following advantages:

[0020] 1. By incorporating at least two annular sealing rings with an interference fit to the spring disc body, along with the wide mating surface and locating surface of the spring disc retainer ring, a double-sealing structure is formed. Firstly, the double sealing rings create redundant sealing under axial pressure. When one seal fails due to wear or extreme operating conditions, the other side can still maintain its seal, significantly reducing the risk of leakage. Secondly, the wide mating surface of the spring disc retainer ring increases the contact area between the metal and the sealing ring, preventing sharp edges from cutting and damaging the sealing ring, thus extending its lifespan. The locating surface restricts the axial displacement of the retaining ring, ensuring a stable connection between the spring disc and the outer cylinder. This design greatly improves sealing reliability and is compatible with existing vibration damper structures, requiring no production line modifications.

[0021] 2. The end face of the spring disc retaining ring adopts a flat design with rounded corners, further optimizing the contact state between the sealing ring and the metal parts. The flat end face can evenly distribute the pressure on the sealing ring, avoiding deformation caused by local stress concentration; the rounded corners eliminate frictional damage to the sealing ring from sharp edges, reducing the generation of surface cracks. Experiments show that this structure can reduce the wear rate of the sealing ring, especially under frequent vibration conditions, significantly improving the stability of the sealing interface.

[0022] 3. The double sealing rings are spaced apart in the axial direction of the spring disc body. The cavity between the two sealing rings forms a pressure buffer layer. When one sealing ring is compressed, the buffer layer can disperse pressure fluctuations and reduce the instantaneous deformation of the sealing rings. Furthermore, too small a spacing will cause the sealing rings to interfere with each other, while too large a spacing will reduce the redundant sealing effect. Testing has shown that this design significantly reduces leakage in the sealing system under high-pressure conditions.

[0023] 4. The cross-sectional diameter of the O-ring is designed to be 1:1.2 to 1.5 times the depth of the mounting groove to ensure appropriate compression during interference fit. At this ratio, the O-ring fully fills the mounting groove gap without excessive compression leading to elastic failure. The compression ratio can be controlled within a reasonable range, balancing sealing performance and durability. Compared to traditional designs, this ratio significantly extends the service life of the O-ring, reduces installation resistance, and improves production efficiency.

[0024] 5. The combination of fluororubber and PTFE coating solves the sealing challenges in high-temperature and chemically corrosive environments. Fluororubber's temperature range (-20℃ to 250℃) covers extreme vehicle operating conditions, and the coating further reduces the coefficient of friction (e.g., from 0.8 to 0.1), minimizing sticky wear between the seal and metal parts. Experiments show that this combination significantly improves corrosion resistance in salt spray tests, making it suitable for vehicles in high-humidity or coastal areas.

[0025] 6. The design of the stepped installation groove and the pressure relief groove solves the problem of stress concentration during the installation of the sealing ring. The stepped structure guides the uniform deformation of the sealing ring, and the pressure relief groove can release the internal air pressure generated by the interference fit, thereby avoiding the local bulging or cracking of the sealing ring. Tests show that this structure greatly improves the installation qualification rate of the sealing ring, and greatly reduces the pressure required during installation.

[0026] 7. The radial through-hole connects the pressure relief groove with the external environment, thereby achieving dynamic pressure balance. When the shock absorber is working, the oil pressure fluctuation can be quickly released through the through-hole, thereby preventing the sealing ring from failing due to excessive internal and external pressure difference. The optimized design of the hole diameter of 1mm-2mm avoids oil leakage and ensures the pressure relief efficiency. In real vehicle tests, this structure greatly improves the stability of the sealing system under continuous bumping conditions.

[0027] 8. The heat dissipation fins are arranged to increase the surface area and accelerate heat dissipation. The optimized design of the fin height and spacing maximizes the heat dissipation efficiency in a limited space, greatly reduces the surface temperature of the spring disc, and the low-temperature environment can slow down the aging of the sealing ring, prolong its service life, and at the same time avoid the decrease of oil viscosity caused by high temperature, thereby maintaining the stability of the shock absorber performance.

[0028] 9. The double sealing interfaces (sealing ring-spring disc, sealing ring-outer cylinder) of the spring disc and the outer cylinder form a three-dimensional sealing network. The precise fit of the clamp spring groove and the clamp spring ensures the axial positioning accuracy, and the double sealing cooperates under high pressure, thereby greatly reducing the overall leakage rate. This design greatly prolongs the sealing life of the shock absorber under harsh road conditions, and is suitable for most single-cylinder shock absorbers on the market.

[0029] 10. The oil guide groove is arranged to ensure that the oil is quickly replenished or returned during the compression / rebound of the shock absorber, thereby avoiding the generation of negative pressure or cavitation in the cavity. Real vehicle tests show that this structure effectively improves the response speed of the shock absorber, effectively reduces the oil temperature rise, and significantly improves the driving comfort. BRIEF DESCRIPTION OF DRAWINGS

[0030] The utility model will be further described in connection with the drawings:

[0031] Figure 1 It is the three-dimensional structure schematic diagram of spring disc structure embodiment one that the utility model discloses.

[0032] Figure 2 It is the sectional view of spring disc structure embodiment one that the utility model discloses.

[0033] Figure 3 It is the exploded view of spring disc structure embodiment one that the utility model discloses.

[0034] Figure 4 It is the sectional view of air spring shock absorber that the utility model discloses.

[0035] Figure 5 For Figure 4 Enlarged view of A.

[0036] Figure 6 For the spring disc structure embodiment two of the utility model discloses a three-dimensional structure schematic diagram.

[0037] The names of the components marked in the figure are as follows:

[0038] 1, spring disc body;11, installation groove;12, heat dissipation fin;13, oil guide groove;2, spring disc retainer ring;21, snap spring cooperation surface;22, positioning surface;23, end surface;3, snap spring;4, annular sealing ring;41, first sealing ring;42, second sealing ring;43, pressure balance hole;5, outer cylinder;51, snap spring groove. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the overall concept of the utility model, the following will be combined with the description of the drawings in an exemplary manner to be described in detail.

[0040] It should be noted that in the following description, many specific details are set forth in order to provide a thorough understanding of the utility model, however, the utility model can also be implemented in other ways different from the description herein, therefore, the protection scope of the utility model is not limited by the specific embodiments disclosed below.

[0041] In addition, in the description of the utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0042] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated;It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication or interaction relationship between two elements. However, it is pointed out that direct connection means that the connection between the two main bodies does not pass through an excessive structure to establish a connection relationship, but only connects through a connection structure to form a whole. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0043] In the present utility model, unless otherwise expressly provided and limited, the first feature is "on" or "under" the second feature, which can be direct contact of the first and second features, or indirect contact of the first and second features through an intermediate medium. In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] As shown in Figures 1 to 3 The utility model provides a spring disc structure of air spring shock absorber, including spring disc body 1, spring disc check ring 2 and snap spring 3, spring disc body 1 is equipped with at least two annular sealing rings 4, annular sealing ring 4 and spring disc body 1 are in interference fit, the inner ring of spring disc check ring 2 is provided with snap spring cooperation face 21 and locating surface 22, snap spring cooperation face 21 width is greater than the width of snap spring 3, and snap spring cooperation face 21 and locating surface 22 all are in contact with snap spring 3, through setting at least two annular sealing rings and spring disc body interference fit, cooperate the wide cooperation face and locating surface of spring disc check ring, form double sealing structure. First, double sealing ring can form redundant seal under axial pressure, when one side seal fails due to wear or extreme working condition, the other side can still maintain the sealing property, significantly reduce the risk of gas leakage. Secondly, the wide cooperation face of spring disc check ring increases the contact area of metal and sealing ring, avoids the cutting damage of sharp edge to sealing ring, prolongs the service life of sealing ring. The locating surface limits the axial displacement of snap spring, ensures the stable connection of spring disc and outer cylinder. This design greatly improves the sealing reliability, simultaneously adapts to the existing shock absorber structure, does not need to transform production line.

[0045] In some embodiments, spring disc check ring 2 is provided with end face 23 in contact with annular sealing ring 4, end face 23 is plane, and the width of end face 23 is greater than the width of snap spring 3. The end face of spring disc check ring adopts plane design and increases round corner transition, which further optimizes the contact state of sealing ring and metal part. The plane end face can evenly disperse the pressure received by the sealing ring, avoiding local stress concentration leading to deformation; the round corner transition eliminates the friction damage of sharp edges to the sealing ring, reducing the generation of surface cracks of the sealing ring. Experiments show that this structure can reduce the wear rate of the sealing ring, especially in the working condition of frequent vibration, the stability of the sealing interface is improved significantly.

[0046] In some embodiments, two annular sealing rings 4 can be provided, including a first sealing ring 41 and a second sealing ring 42, which are arranged in the axial direction of the spring plate body 1. The two sealing rings are arranged in the axial direction of the spring plate body, and the cavity between the two sealing rings can form a pressure buffer layer. When one side of the sealing ring is pressed, the buffer layer can disperse the pressure fluctuation and reduce the instantaneous deformation of the sealing ring. In addition, if the spacing is too small, the sealing rings will interfere with each other, and if the spacing is too large, the redundant sealing effect will be reduced. Tests have shown that this design can greatly reduce the leakage of the sealing system under high pressure working conditions.

[0047] In some embodiments, the annular sealing ring 4 can be an O-shaped sealing ring, and the cross-sectional diameter of the O-shaped sealing ring is 1:1.2-1.5 times the depth of the mounting groove 11 on the spring plate body 1. The cross-sectional diameter of the O-shaped sealing ring is designed to be 1:1.2-1.5 times the depth of the mounting groove, which ensures that the sealing ring is moderately compressed when it is interference fit. Under this ratio, the sealing ring can fully fill the gap in the mounting groove, and it will not lose its elasticity due to excessive compression. The compression rate can be controlled within a reasonable range, which can balance the sealing performance and durability. Compared with traditional designs, this ratio can greatly extend the service life of the sealing ring, reduce the installation resistance, and improve the production efficiency.

[0048] In some embodiments, the material of the annular sealing ring 4 can be fluororubber, and the surface of the annular sealing ring 4 can be coated with a wear-resistant coating with a thickness of 0.05mm-0.1mm. The combination of fluororubber material and polytetrafluoroethylene coating solves the sealing problem in high-temperature and chemical corrosion environments. The temperature resistance range of fluororubber (-20℃ to 250℃) covers extreme working conditions of vehicles, and the coating further reduces the friction coefficient (e.g., from 0.8 to 0.1), reducing the adhesive wear between the sealing ring and the metal parts. Experiments have shown that this combination of materials has greatly improved corrosion resistance in salt spray tests and is suitable for vehicles in high-humidity or coastal areas.

[0049] In some embodiments, a stepped mounting groove 11 can be provided in the spring plate body 1, and the annular sealing ring 4 is interference fitted at the stepped surface of the mounting groove 11. The bottom of the mounting groove 11 is provided with a pressure relief groove. The stepped mounting groove and the pressure relief groove solve the problem of stress concentration during installation of the sealing ring. The stepped structure guides the uniform deformation of the sealing ring, and the pressure relief groove can release the internal gas pressure generated by the interference fit, avoiding local bulging or cracking of the sealing ring. Tests have shown that this structure can greatly improve the installation qualification rate of the sealing ring, while greatly reducing the pressure required during installation.

[0050] In some embodiments, a pressure balance hole 43 can be provided on the inner side of the annular sealing ring 4, the pressure balance hole 43 penetrates to the mounting groove 11 of the spring disc body 1, the diameter of the pressure balance hole 43 is 1mm-2mm, the radial through hole communicates the pressure relief groove with the external environment, and dynamic pressure balance is realized. When the shock absorber works, the oil pressure fluctuation can be quickly released through the through hole, preventing the sealing ring from failing due to excessive internal and external pressure difference. The optimized design of the hole diameter of 1mm-2mm avoids oil leakage and ensures the pressure relief efficiency. In real vehicle tests, the structure greatly improves the stability of the sealing system under continuous bumping conditions.

[0051] In some embodiments, as shown in Figure 6 The outer periphery of the spring disc body 1 is provided with a heat dissipation fin 12, which is uniformly distributed in the circumferential direction. The heat dissipation fin is arranged to increase the surface area and accelerate heat dissipation. The optimized design of the fin height and spacing maximizes the heat dissipation efficiency in a limited space, greatly reduces the surface temperature of the spring disc, and the low-temperature environment can slow down the aging of the sealing ring, prolong its service life, and at the same time avoid the decrease of oil viscosity caused by high temperature, and maintain the stability of the shock absorber performance.

[0052] As shown in Figures 4 to 5 The utility model discloses a spring disc shock absorber, comprising an outer cylinder 5, the outer cylinder 5 is equipped with the spring disc structure in above-mentioned any technical scheme, the outer cylinder 5 is equipped with snap spring groove 51, and the snap spring 3 is installed in the snap spring groove 51, and the annular sealing ring 4 is in interference fit with the outer cylinder 5, so that the double sealing interface (sealing ring-spring disc, sealing ring-outer cylinder) of spring disc and outer cylinder forms the three-dimensional sealing network. The precise cooperation of the snap spring groove and the snap spring ensures the axial positioning accuracy, and the double sealing cooperates under high pressure, so that the overall leakage rate is greatly reduced. This design greatly prolongs the sealing life of the shock absorber under harsh road conditions, and is suitable for most single-cylinder shock absorbers on the market.

[0053] In some embodiments, an oil guide groove 13 is arranged between the spring disc body 1 and the outer cylinder 5, the oil guide groove 13 is annular and communicates with the oil cavity of the shock absorber. By arranging the oil guide groove, the oil is quickly replenished or returned during compression / rebound of the shock absorber, avoiding negative pressure or cavitation in the cavity. Real vehicle tests show that the structure effectively improves the response speed of the shock absorber, while effectively reducing the oil temperature rise, and significantly improves the driving comfort.

[0054] In addition to the above preferred embodiments, the technical solutions of the utility model are not limited to the above embodiments, it should be pointed out that the technical solutions of any one embodiment combined with the technical solutions of one or more other embodiments are within the protection scope of the utility model. Although the utility model has been described in detail by general description and specific embodiments above, some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the utility model all belong to the protection scope of the utility model.

Claims

1. A spring plate structure of an air spring damper, comprising a spring plate body, a spring plate retainer, and a circlip, characterized in that, The spring disc body is provided with at least two annular sealing rings, the annular sealing rings are in interference fit with the spring disc body, the inner ring of the spring disc retainer is provided with a snap spring fit surface and a positioning surface, the width of the snap spring fit surface is greater than the width of the snap spring, and the snap spring fit surface and the positioning surface are in contact with the snap spring.

2. The spring disc structure according to claim 1, characterized in that The spring disc retainer is provided with an end surface in contact with the annular sealing ring, the end surface is a plane, and the width of the end surface is greater than the width of the snap spring.

3. The spring disc structure of claim 1, wherein The annular sealing ring is provided with two annular sealing rings, the annular sealing rings comprise a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are arranged at intervals along the axial direction of the spring disc body.

4. The spring disc structure of claim 1, wherein The annular sealing ring is an O-shaped sealing ring, the cross section of the O-shaped sealing ring is circular, and the ratio of the cross section diameter of the O-shaped sealing ring to the groove depth of the mounting groove on the spring disc body is 1:1.2-1.

5.

5. The spring cup structure of claim 1, wherein, The material of the annular sealing ring is fluorine rubber, and the surface of the annular sealing ring is coated with a wear-resistant coating, and the thickness of the wear-resistant coating is 0.05mm-0.1mm.

6. The spring disc structure of claim 1, wherein The spring disc body is provided with a stepped mounting groove, the annular sealing ring is installed in interference at the stepped plane of the mounting groove, and the bottom of the mounting groove is provided with a pressure relief groove.

7. The spring cup structure of claim 6, wherein The inner side of the annular sealing ring is provided with a pressure balance hole, the pressure balance hole penetrates to the mounting groove of the spring disc body, and the diameter of the pressure balance hole is 1mm-2mm.

8. The spring disc structure of claim 1, wherein The outer periphery of the spring disc body is provided with heat dissipation fins, and the heat dissipation fins are uniformly distributed in the circumferential direction.

9. A bellows spring damper comprising an outer cylinder, characterized in that The outer cylinder is provided with the spring disc structure according to any one of claims 1-8, the outer cylinder is provided with a snap spring groove, the snap spring is installed in the snap spring groove, and the annular sealing ring is in interference fit with the outer cylinder.

10. The air spring damper of claim 9, wherein, The spring disc body and the outer cylinder are provided with an oil guide groove, the oil guide groove is annular and communicates with the oil cavity of the shock absorber.

Images